The vaccine
What are normal reactions to the vaccine?
These reactions usually go away without treatment:
The arm receiving the vaccination may be sore and red where the vaccine was given.
The glands in the armpits may become large and sore.
The vaccinated person may run a low fever.
One out of 3 people may feel bad enough to miss work, school, or recreational activity or have trouble sleeping.
If the vaccination is successful, a red and itchy bump develops at the vaccination site in three or four days. In the first week after vaccination, the bump becomes a large blister, fills with pus, and begins to drain. During week two, the blister begins to dry up and a scab forms. The scab falls off in the third week, leaving a small scar. People who are being vaccinated for the first time may have a stronger "take" (a successful reaction) than those who are being revaccinated.
Major (primary) reaction – Expected vaccine site reaction and progression following primary smallpox vaccination or revaccination after a prolonged period between vaccinations. Multiple pressure vaccination technique used. Source: CDC Also known as the Centers for Disease Control and Prevention - A United States government agency that seeks to promote health and quality of life by preventing and controlling disease, injury, and disability..